Starrett 53378 Dial Drop Indicator 0.025 in Range Lug Back

Product Description

The STARRETT 53378 is a dial drop indicator designed for precise surface and dimensional measurement in machining, metrology, and inspection applications. It covers a measurement range of 0 to 0.025 inches with a graduation of 0.0001 inches per division, providing resolution suitable for close-tolerance work. The 0-5-0 balanced dial reading allows technicians to detect deviation in both directions from zero without repositioning the indicator. The indicator features a jeweled bearing for smooth, repeatable stylus travel and a stainless steel stem measuring 0.375 inches in diameter. A no-glare satin finish on the white dial face reduces eye strain during extended use. Installed by machinists, toolmakers, and quality control technicians.

This indicator is suited for use in machine shops, tool rooms, and quality inspection stations where fine surface variation, runout, or part alignment must be verified. Its lug back mounting style is compatible with standard indicator holders and magnetic base arms. A flat back is included, expanding mounting options on flat surfaces and surface plates. The 0.010 inches per revolution travel rate suits applications requiring fine measurement over a short total range, such as checking spindle runout, flatness, or part concentricity.

Key Features

• Measurement range of 0 to 0.025 inches with 0.0001 inches graduation for high-resolution readings
• Jeweled bearing construction for smooth stylus movement and long service life
• 0-5-0 balanced dial reading for bidirectional deviation measurement
• No-glare satin finish on white dial face for clear reading under shop lighting
• Stainless steel stem at 0.375 inches diameter resists corrosion in coolant environments
• Includes both lug back and flat back for flexible mounting
• Unbreakable crystal protects the dial face from impact damage

Compatibility

Designed as an OEM-style dial drop indicator compatible with standard lug back and flat back indicator holders, magnetic bases, and surface plate stands used in general machining and inspection setups.

Installation Notes

Installation is performed by machinists or metrology technicians using a compatible indicator holder or magnetic base arm. Ensure the holder clamps securely on the lug or flat back before taking measurements. The workpiece and machine spindle should be stationary and free of vibration before zeroing the dial. Avoid side-loading the stem beyond its designed contact range to prevent damage to the jeweled bearing.